Wire-stitching machine



J. W. NASMITH.

WIRE STITCHING MACHlNE.

APPLICATION men SEPT 9,1919.

1,37 1 ,388. Patented Mar. 15, 1921.

JOHN WILLIAM NASMITH, OF MANCHESTER, ENGLAND.

WIRE-STITCHING MACHINE.

Specification of Letters Patent.

Patented Mar. 15, 1921.

Application filed September 9, 1919. Serial No. 322,757.

To a-ZZ TU/lcfll it may concern:

Be it known that I, JOHN WILLIAM. I" irrrr, a subject of the King ofGreat Entain, residing at Leegate, Heaton-Mersev, Manchester, England,have invented "l useful Improvements in firex cm i ching Machines, ofwhich the following a specification.

This invention relates to improvements in wire-stitching machines, andmore particularly to the type of machine in which the r'ze of the stapleis fixed when the magit rming head to descend nip the material on astationary anvil, during this descent the feed is made. head thenremains stationary while the 'torming bar bends the staple and thedriver ives it home, and means, usually in the m of a cam, are employedto hold the head or the forming-bar down during the operation ofdriving, and in order to allow for small variations in the-thickness ofthe material, arrangements are made to raise or lower the whole head andits mechanism. .riso in such machines the head or the fornr ing-barremains down, clamping the material on the anvil until the driver hasrisen some distance after completing the driving of the staple, andprevents the operator from immediately displacing the material to posiitfor the next stitch. It is desirable to e the brief time available forthis displacement as long as possible. Finally it has not been usual insuch machines to provide a support for the legs of the staple while itis being driven.

The objects cf the present invention are to simplify the mechanism bydispensing with the movement of the head, by using a single cam andlever to operate the stapledriver, and mounting on the end of the leversuitable means to operate the stapleformer, to combine with such means afrog or support for the staple while it is being driven, and to soarrange the mechanism that the frog, the staple-driver, and thestaple-former shall all rise together and release the material themoment the driving the staple is completed.

These various points will now be described in detail with reference tothe drawing, in which- Figures 1 and 2 are side and end .ele-

vations respectively, of the machine when at rest before the strokecommences.

F1gs. 3 and a are side and end elevations respectively, of the machineshowing position of the parts at the moment the driving of the staple iscompleted.

Fig. 5 shows a small detail of the machine.

I will now describe my device, referring to the drawings in detail byreference numerals, the same numerals designating the same partsthroughout the drawings.

A represents an avil, which is mounted for vertical adjustment on an armR, adjustment being accomplished through the medium of anadjusting-screw 30, or by any other suitable means. The arm R isprovided at its upper end with a horizontally extending portion inparallelism with the anvil A, and having formed on its outer end a headH. Pivotally mounted intermediate of its ends on an upwardly projectingextension of arm R, by means of the fixed stud S, is a lover L, havingone end connected to a earn (3 by means of a pin 1, on which is mounteda roller B, adapted to ride in an irregular slot or groove M formed inthe cam, the opposite end of the lever being connected with a driver I)slidably mounted in the head H. The cam is mounted for rotation about astud P, fixed to the arm R, and has a projecting cam surface 3 on oneedge thereof. Pivoted to the cam C by means of a pin 2 is aconnecting-rod O, to the lower end of which may be connected a treadle,a power device, or any other suitable means, for actuating said rod, andthereby turning the cam C on its pivot. The groove 01' slot M in cam Chas a portion M. which is curved on the arc of circle substantiallyconcentric with the pivot P and a portion M eccentric thereto for apurpose which will presently appear.

Pivotally mounted at 31 on the arm R is a lever 5, to one end of whichis pivotally attached a rod 33, at the forward end of which is carried asuitable means for feeding wire. This feeding means may be of any of theusual types well known inthe art, and is omitted inasmuch as itconstitutes no part of the present invention. The upper end of lever 5is connected to arm B through the medium of a contractile spring 34, bywhich the rod 33 is normally held retracted. Extending from the leverbetween the pivot points 31, and 32 is a pin on which the upper end ofthe staple-former i to be 7 described.

the roller 4: is mounted, said roller being adapted to press at alltimes against the edge of the cam C.

As the cam C moves from the position shown in Fig. 1 to that shown inFig. 3, the roller B rides in the circular path and the lever L receivesno motion, while at the same time the roller 4 rides on the projectingcam surface 3 moving lever 5, against the force of spring an andelfecting the feed. Simultaneously with the completion of the feed, theroller B begins to ride in the inclined eccentric portion l of the slot,driving the roller B upward and rocking the lever L, forcing the driverD downwardly.

Cast on the under side of the lever L are twoprojections 6 and 7,apertured to receive a rod 8, on the outer end of which is a block 9,arranged to rest against and slide on 'a finished face 10, on the underside of the lever. The outer face of the block 9 is inclined downwardlyand rearwardly as shown at 11, for a purpose which will appear later. Onthe rod 8 is fixed. in a suitable position, a collar 12 and a spiralspring G is placed in compression between the collar and the projection7, which forces the rod 8 and block 9 outwardly, until arrested by theadjusting nuts 13 abutting against the projection.

A stapleformer F is slidably mounted n a groove formed in the head H.and is tsclf grooved to receive the driver D. which s provided with aninclined surface 14, formed on the inner vertical face thereof.

The under face of the block on r until. as the lever Ldescends,describing an arc of a circle with the studs as center. it isdrawn of? the top of the staple-former,

bottom of the staple-former l and the anvil. in order that the staple v-former maybe held firmly down on the mat al while the staple beingdriven by the continued descent of the driver l). the inclined face 11of the bloclcf) force. down the inclined face 14:

at the top of the staple-former. against the n V Iorce of the spring (lwhich is further compressed so that the staple-former is firmly helddown on the material, notwithstanding its tendency to rise under theinfluence of the. spring as will now be described.

Spring); Z is attached to one end of a lever 15 pivoted at 15 on thehead H. having an arm 15 which projects below a roller 16, carried on apin 17 fixed in a pendant 18. The other end of the spring Z is attachedto the lower end of a lever 19 which swings on a fixed pin 20;

extending from. the head H, and presses a roller 21 carried on the lowerend thereof iirnilv against the back of the pendant 18, tendine to holda suitably formed frog or support ii projecting from its lower extremityin the forked lower end of the staple-former and consequently betweenthe legs of the staple, whenceit is forced out by the descending driveras the staple is being driven. pendant 18 is formed with a slot 22engagedv on a pin 23, fixed in the staple-former F.

Cast upon the pendant 18 is a projection 24; which is normally held bythe tension of spring Z acting through lever 15, and tending to raisependant 18, against pin 20 by which the upward movement of the pendantis limited. ever. is free to be raised further. and is limited only bythe upper end of the slot 22. and is raised by means of a pin 25 Theupper end, of the The staple-former F, howformed thereon which fits inslot 26 formed 7 in the driver D when the lower limit of said slot comesin contact with said pin. the

driver and former again ascends together .v standing; the spring Z. Whenthe driver is no longer moving downward. but on the contrary. begins torise. the stapleor F and the pendant 18 rise with it, sin e the forceof'the spring G is not so .owering as to keep the staple-former l down.unless assisted by the friction of iding level- L. forcing the incline.1 the incline 14:. Therefore, all rise together and release thematerial lately the driving of the staple is They continue to risetogether 1 the upward movement of the pendant sted by the projection 24coming against the pin 20. The staple-former also ceases to rise (sincesprii Z has ceased to act on it) until the continued rise of the andoperate a support for the staple legs while the staple is being driven,and cause the staple-former to rise with the driver and give theoperator the maximum possible to position the material for the nextroke. X

i is SOZiEQtlIDQS required to have the anvil A very long, and the armsof the lever become oi-res ondingly long. In such cases the aredescribed by the block 9 approxiic tcs to a straight line. it becomesdifii lt by mean or" the nuts 13 to adjust prec l the moment when theblock 9.slips off the top of the staple-former F, so as to coincide withthe clamping of the material. several m ans may be devised to efiectthis the required moment. One such means shown in Fig. 5. A. suitablyshaped iece 27, is carried by and adjustable on the iraming and aprojection 28 is formed on the collar and abuts against the back i thelever L to prevent turning. This pro- ,ection comes in contact. at therequired moment. with the incline 27, which is so formed forced theblock 9 off the top 0 it no longer contacts with the projecion :.8, butallows the incline 11 to press ,gainst the incline 1%, as shown in Fig.

l claim In a wire-stitching machine, a stationary head, a stapleformerand a driver slicahly mounted in said head, an anvil extending beneathsaid head, a cam and lever for operating said staple-former and driver,means on the end of the lever to force the stapletornier positivelydownward until a has been formed and clamped on said anvil and to holdit down while the driver descends to drive and clench the staple andmeans whereby the staple-former and driver commence their ascentsimultaneously the moment the driving and clenching oi the staple iscompleted.

2. In a wire-stitching machine, a stationary head. 1 staple-former and adriver slidahly mounted in said head, an anvil extend ing beneath saidhead, a cam and lever for op -sting sai... staple former and driver, m son the end of the lever to force the staple-former positively downwarduntil a .Ple has been formed and cl "4 ed on said a; vil to hold it downwine the driver descends 5:0 drive and clcnch the staple and a pe dantattached to said staple-former sn g-pressed upward y whereby thestaple-- m ner is raised simultaneously with the driver when the drivingand clenching oi the st: le rare completed and the driver startsupwardly.

3. in a wire-stitching machine. a stationary head. :1 staple-former anda. driver slidably mounteo in said head, an anvil extend Eng beneathsaid head. a cam and lever for operating said staple-former and driver,means on the end of the lever to force the hat. having staple-formerpositively downward until a staple has been formed and clamped on saidanvil and to hold it down while the driver descends to drive and clenchthe staple and a pendant attached to said staple-former hava frogextending therefrom to support said staple-former, said pendant beingspring-pressed upwardly whereby the stapleiormer is raisedsimultaneously with the driver when the driving and clenching of thestaple are completed.

In a wire-stitching machine, a station-- my head, a'staple-iormer and adriver slidably mounted in said head, an anvil extendbeneath said head,a cam and lever for operating said staple-former and driver, means onthe end of the lever to force the s aple-former positively downwarduntil a staple nas been formed and clamped on said anvil and to hold itdown while the driver descends to drive and clench the staple, resilientmeans tending to raise said stapleformer when so held down whereby whenthe driver starts to rise the staple-former will rise simultaneouslytherewith.

5. In wirestitching machine, a stationary head, a stziple foriner anddriver slidable vertically in said head, an anvil extending beneath saidhead, a cam and lever for operating said staple-former and driver, aspring controlled rod on the under side of said lever having a block onits outer end, said block being adapted to rest on the upper end of saidstapleformer d to force it positively downwardly in said head intoposition to clamp stapleforming material on said anvil. when the leveris operated, said staplcformer being provided at its upper end with arearwardly and downardly beveled surface, a corresponding surface on theforward end of the said block, the relation t the parts being such. thatwhen said 0.2. former has reached a. position to grip said m ial theblock will slide off the top of former and the beveled faces will cob'peate to hold the former in gripping position while the driver descends todrive the staple.

ln :2 wire-stitching machine, a stationall) upper end olt saidstaple-former and to iorce it positively downwardly in said head intoposition to clamp staple-forming material on said anvil when the leveris operated. said staple-former being provided at its upper end with arearwardly and dowrwardl'v beveled surface, a corresponding surface onthe forward end of said block, the relation of the parts being such thatwhen said former has reached a position to grip said material the blockwill slide off the top of said former and the beveled faces willcooperate to hold the former in gripping position while the driverdescends to drive the staple, and means whereby the staple-former anddriver commence their ascent simut taneously the moment the driving andclenching of the staple is completed.

7. In a Wirestitching machine, a station ary head a staple-former and adriver slidable vertically in said head, an anvil located below saidhead, a cam and lever for oper' ating said former and driver, a springcontrolled block on the under side of said lever, said block beingadapted to rest on the upper end of said stapleformer and to force itpositively downwardly in said head into position to clamp staple-formingmaterial on said anvil when the lever is operated,,said staple-formerbeing provided at its upper end with a rearwar'dly and downwardlybeveled surface, a corresponding surface on the forward end of saidblock, the relation of the parts being such that when saidformer hasreached a position to grip said material, the block will slide off thetop of said former and the beveled faces will coiiperate to hold theformer in gripping position while the driver descends to drive thestaple. V

8. In a wire-stitching machine, a stationary head, a staple-former anddriver slidable vertically in said head, an anvil extending beneath saidhead, a cam and lever for operating said stapleformer and driver, aspring-controlled rod on the underside of said lever having a block onits outer end, said block being adapted to rest on the upper end of saidstaple-former and to force it positively downwardly in said head intoposition to clamp staple-forming material on said anvil when the leveris operated, s'aid staple-former being provided at its upper end with arearwardly and downwardly beveled surface, a corresponding surface onthe forward end of said block, adjusting nuts on said rod whereby therelation of said block to said former may be regulated so that the blockwill slide off of the top of said former when the lower end of theformer has reached a position to grip stapie-forming material in saidanvil, and the beveled faces will cooperate to hold the former ingripping position while the driver descends to drive the staple.

9. In a wire-stitching machine, a stationary head, a staple-former anddriver slidalole vertically in'said head. a cam and lever for operatingsaid staple-former and driver, an apertured projection on the undersideof said lever, a rod reciprocally mounted in said lugs, a block on theforward end of said rod, slidable against the under surface of saidlever and adapted to rest on the upper end of said staple-former and toforce it downwardly into position to clamp staple-forming material onsaid anvil when the forward end of the lever descends, said block andsaid staple-former being provided with complemental sloping faces, acollar on said rod and a compression spring between said collar and oneof said projections for forcing said block forward, adjusting nutsscrewthreaded on said rod whereby the tension of said spring may beadjusted so that the block will slide off the top of said former andonto the inclined surface of the former, at the time it contacts withthe staple-forming material and means to adjust the tension of saidspringsuiiiciently to hold said former in clamping position while thedriver descends to drive the staple.

10. In a wire-stitching machine, a stationary head, a staple-former anddriver slidable vertically in said head, an anvil extending beneath saidhead, a cam and a lever for operating said staple-former and driven andapertured lugs on the under side of said lever, a rod reciprocallymounted in said. lugs, a block on the'forward end of said rod, slidableagainst the under-surface of said lever and adapted to rest on the upperend of saidstapleformer and to force it downwardly into position toclamp stapleforming material on said anvil when the forward end of thelever descends, said block and s'aidstaple-former being provided withcomplemental sloping faces, a collar on said rod and a compressionspring between said collar and one of said proiections for forcing saidblock forward, adjusting nuts s rewthreaded on said rod whereby thetension of said snrinr may be adjusted so that the block will slide offthe top of said former and onto the inclined surface of the former. atthe time it contacts with the staple-forming material and to adiust thetension of said spring so as to regulate the force with which the blockis forced against the inclined surface on the former.

11. In awire-stitching machine, a head, an anvil therebeneath, a cam anda lever and supporting means therefor, a former and a driver slidablymounted in said head, said former beinr; adapted to be brought intoposition to clamp staple-forming material on said anvil, a springpressed block slidably mounted on the lower side of said lever andadapted to rest on the top of said former while the former moves intoclamping position, an inclined surface on said former, a correspondinglyinclined surface on said block, means for sliding the block off theupper end of said former onto said inclined surface when the former hasreached clamping position.

JOHN WILLIAM NASMITH.

